If you are using Iscatterv (I guess it is that one), it handles the pairs itself. You shouldn't bypass it because you think it is better. You don't know how it is implemented, so just call Iscatterv for all ranks.
2014-07-16 14:33 GMT+01:00 Ziv Aginsky <zivagin...@gmail.com>: > I know the standard, but what if I can not bypass the send message. For > example if I have MPI_Iscatter and for some ranks the send buffer has zero > size. At those ranks it will jump the MPI_Iscatter routine, which means I > have some zero size send and no receive. > > > > > On Wed, Jul 16, 2014 at 3:28 PM, Matthieu Brucher > <matthieu.bruc...@gmail.com> wrote: >> >> Hi, >> >> The easiest would also to bypass the Isend as well! The standard is >> clear, you need a pair of Isend/Irecv. >> >> Cheers, >> >> 2014-07-16 14:27 GMT+01:00 Ziv Aginsky <zivagin...@gmail.com>: >> > I have a loop in which I will do some MPI_Isend. According to the MPI >> > standard, for every send you need a recv!!!! >> > >> > If one or several of my MPI_Isend have zero size buffer, should I still >> > have >> > the mpi_recv or I can do it without recv? I mean on the processor which >> > I >> > should recv the data I know priory that my buffer is with zero size. Can >> > I >> > jump from MPI_Recv. >> > >> > The question is because of the format of the program I am using if it >> > knows >> > that the receiving buffer is zero it will not call the routine which >> > contains mpi_Recv. >> > >> > >> > >> > >> > _______________________________________________ >> > users mailing list >> > us...@open-mpi.org >> > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> > Link to this post: >> > http://www.open-mpi.org/community/lists/users/2014/07/24781.php >> >> >> >> -- >> Information System Engineer, Ph.D. >> Blog: http://matt.eifelle.com >> LinkedIn: http://www.linkedin.com/in/matthieubrucher >> Music band: http://liliejay.com/ >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2014/07/24782.php > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2014/07/24783.php -- Information System Engineer, Ph.D. Blog: http://matt.eifelle.com LinkedIn: http://www.linkedin.com/in/matthieubrucher Music band: http://liliejay.com/
